OPTICAL SENSOR SYSTEM FOR pH DETERMINATION INDEPENDENTLY OF THE ION STRENGTH USING FLUORESCEIN BOUND TO A POLYMER VIA A URETHANE AND/OR UREA GROUP

摘要

The invention relates to an optical sensor for pH determination independent of the ion strength which comprises a solid polyurethane, polyurea-urethane or polyurea composition containing pH-sensitive fluorescein bound via a urea or urethane group in the form of a membrane on a transparent support material. The invention also relates to an optical fluorescence method which permits high-accuracy pH determination independent of the ion strength of the measurement solution. The method is particularly suitable for determining the pH of physiological solutions, in particular for determining the pH of blood.